Technical description and composition of the SONY KDL-40NX700 TV, panel type and applicable modules. The composition of the modules.SONY
Model: KDL-40NX700
Chassis / Version: AZ1-H
Panel: LK400D3LA4
Inverter (backlight): integrated into PSU
PWM Inverter: LV5768M
MOSFET Inverter: ATP201
Power Supply (PSU): GE3A A1754371A
PWM Power: CXA3809M, MIP2H2
MOSFET Power: TK15A50D, 2SK4096LS
MainBoard: A1766469A Y20087701 177202-103
IC MainBoard: MC-10152F1, K9F1208U0C
Tuner: SUT-HA101Z
Technical Specifications KDL-40NX700
SONY KDL-40NX700
General recommendations for repairing TV LCD
Possible malfunctions
- The SONY KDL-40NX700 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
Failure in such cases should begin to be sought in the GE3A power supply circuits. It is necessary to measure its output voltages, and if they are absent (full or partial), the power switches (TK15A50D, 2SK4096LS) of the converters and rectifier diodes should be checked for possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers CXA3809M, MIP2H2, in the absence of visible damage or obvious short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the power supply of the inverter are serviceable, you should make sure that the lamps are in good working condition, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the A1766469A motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - MC-10152F1, K9F1208U0C and replace failed chips with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
Before changing the SUT-HA101Z tuner, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages that must be measured at the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Attention! For users and owners of KDL-40NX700 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
Service manual / schematic diagram -------------> SONY KDL-40NX700 Chassis AZ1-H
The appearance of the MainBoard A1766469A is shown in the figure below:A1766469A
Main features of the device SONY KDL-40NX700:
Installed matrix (LCD panel) LK400D3LA4.
To power the backlight, a converter is used, combined with the power supply, controlled by the LV5768M PWM controller. As power elements of the inverter, keys of the ATP201 type are used.
The necessary supply voltages for all nodes of the SONY KDL-40NX700 TV are generated by the GE3A power module or its analogs using CXA3809M, MIP2H2 microcircuits and power switches of the TK15A50D, 2SK4096LS type.
MainBoard - the main board (motherboard) is an A1766469A module, using MC-10152F1, K9F1208U0C and others.
The SUT-HA101Z tuner provides TV reception and channel tuning.